When a girl goes down on a guy, takes his semen in her mouth and then comes up to him and spits it in his face. Much like a llama spits at people in anger.

Judy was pissed off at Bill for the rumors he started about her, so she took him into the back room of a party, sucked him off and then spit it in his face right in the middle of the living room in front of everyone. Everyone knew she was 'The Llama.'